foo.c: In function 'main':
foo.c:5:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d",&n);
  ^~~~~
foo.c:5:2: warning: incompatible implicit declaration of built-in function 'scanf'
foo.c:5:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
foo.c:7:6: warning: implicit declaration of function 'ss' [-Wimplicit-function-declaration]
   if(ss(i)&&ss(n-i))
      ^~
foo.c:8:4: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    printf("%d+%d=%d\n",i,n-i,n);
    ^~~~~~
foo.c:8:4: warning: incompatible implicit declaration of built-in function 'printf'
foo.c:8:4: note: include '<stdio.h>' or provide a declaration of 'printf'
foo.c:6:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=3;i<=n/2;i++)
  ^~~
foo.c:9:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   return 0;
   ^~~~~~
foo.c: In function 'ss':
foo.c:16:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=2;i<=sqrt(m);i++)
  ^~~
foo.c:22:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   return b;
   ^~~~~~

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